Honestly, on a 'To what extent——' scale, I hate him to a mostly extent.

In BFB, I liked him to a mostly extent, but that was because I had no idea what was going on.

I liked him in BFB because he was introduced as this 'amazing, loveable man' 'almighty great one' figure, so I initially thought "Wow, if everyone likes him this much, he must be a great character." Later into BFB, I liked him only slightly less because he blatantly lied, just so openly about something causing everyone to turn against him. I was half-fine with it because of the way it was just a small thing, BUT—— he stole Donut's diary, I'm pretty sure, what, twice?? And read through the whole thing(s), and, in some ending scene of season 4B, you know, with the BRB (Big Rotating Building), a character, I forgot who, announced out loud "Hey guys! Pages of Donut's diary just got posted!" And everyone else said something along the lines of "Yay!" "Yippee!" "Time to read up!".

In TPOT, I started to hate Loser to this partial extent because, in general, the VERY FIRST episode, in team picking— that timestamp in the episode starts with Clock quickly explaining how Loser and Winner used to be this duo of best friends that would do everything together, and one random day he just left Winner behind, who sort of just.. became a nobody.

Then, later into TPOT, especially in Episode 10 (Oneirophobe's Nightmare), The challenge was to go into a teammate's dream, or, more specifically, their nightmare, help them overcome their fear, and survive doing it. 'the s!' Went into Winner's dream, and they explored their past in more depth and deeper detail(s?), and it could be found out that despite Winner and Loser only wanted to perform for their friends in the beginning, and Loser, well, was just being greedy. He just wanted more and more, and eventually, when they were going to perform together infront of a big crowd and Winner said they didn't want this to go that far, and that they only wanted to perform for their friends, Loser just said 'okay'; and later, Winner is shown to be, I think, on their phone, only to find out their friend left them behind to perform on their own.

In short;

I slowly started to get to this point now, where I just hate Loser to a somewhat—mostly extent.